Ring Sizer

Sizes (British) Internal Diameter (mm)
G 14.36
G1/2 14.56
H 14.65
H1/2 14.86
I 15.04
I1/2 15.27
J 15.40
J1/2 15.70
K 15.80
K1/2 16.00
L 16.10
L1/2 16.41
M 16.51
M1/2 16.71
N 16.92
N1/2 17.13
O 17.35
O1/2 17.45
P 17.75
P1/2 17.97
Q 18.19
Q1/2 18.35
R 18.61
R1/2 18.80
S 19.10
S1/2 19.31
T 19.51
T1/2 19.84
U 20.02
U1/2 20.20
V 20.32
V1/2 20.68